AD5321 Просмотр технического описания (PDF) - Analog Devices
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AD5321 Datasheet PDF : 24 Pages
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Data Sheet
2.5 V to 5.5 V, 120 μA, 2-Wire Interface,
Voltage-Output 8-/10-/12-Bit DACs
AD5301/AD5311/AD5321
FEATURES
AD5301: buffered voltage output 8-bit DAC
AD5311: buffered voltage output 10-bit DAC
AD5321: buffered voltage output 12-bit DAC
6-lead SOT-23 and 8-lead MSOP packages
Micropower operation: 120 μA at 3 V
2-wire (I2C-compatible) serial interface
Data readback capability
2.5 V to 5.5 V power supply
Guaranteed monotonic by design over all codes
Power-down to 50 nA at 3 V
Reference derived from power supply
Power-on reset to 0 V
On-chip rail-to-rail output buffer amplifier
3 power-down functions
APPLICATIONS
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
GENERAL DESCRIPTION
The AD5301/AD5311/AD53211 are single 8-/10-/12-bit, buff-
ered, voltage-output DACs that operate from a single 2.5 V to
5.5 V supply, consuming 120 μA at 3 V. The on-chip output
amplifier allows rail-to-rail output swing with a slew rate of
0.7 V/μs. It uses a 2-wire (I2C-compatible) serial interface that
operates at clock rates up to 400 kHz. Multiple devices can share
the same bus.
The reference for the DAC is derived from the power supply
inputs and thus gives the widest dynamic output range. These
devices incorporate a power-on reset circuit, which ensures that
the DAC output powers up to 0 V and remains there until a
valid write takes place. The devices contain a power-down
feature that reduces the current consumption of the device to
50 nA at 3 V and provides software-selectable output loads
while in power-down mode.
The low power consumption in normal operation makes these
DACs ideally suited to portable battery-operated equipment. The
power consumption is 0.75 mW at 5 V and 0.36 mW at 3 V,
reducing to 1 μW in all power-down modes.
FUNCTIONAL BLOCK DIAGRAM
VDD
SCL
SDA
A0
A1*
INTERFACE
LOGIC
POWER-ON
RESET
DAC
REGISTER
AD5301/AD5311/AD5321
REF
8-/10-/12-BIT
DAC
BUFFER
VOUT
POWER-DOWN
LOGIC
RESISTOR
NETWORK
GND
PD*
*AVAILABLE ON 8-LEAD VERSION ONLY
Figure 1.
1 Protected by U.S. Patent No. 5684481.
Rev. C
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